This work investigates systematic approaches to improve the current efficiency of the devised top-emission organic light emitting diode (TOLED) with a UV-ozone-treated reflective Ag anode, doped emission layer, and hole-blocking layer. The work function of the Ag anode can be increased under the UV-ozone exposure to improve the current density-voltage property of TOLED. Yet, degraded sheet resistance and reflectance characteristics of the Ag anode are observed. Therefore, a trade-off to obtain optimum performance of the studied TOLED is investigated. Besides, structural design by doping 2,3,6,7-tetrahydro-1,1,7,7,-tetramethyl-1H,5H,11H-10-(2-benzothiazolyl)q uinolizino-[9,9a,1gh]coumarin into the emission layer to improve the carrier recombination efficiency to obtain enhanced current efficiency is also studied.